The replacement cost of a furnace depends on the size, type of furnace, geographic location and if any duct work or if the system requires additional modifications. A .Replacing a furnace can be a very expensive but very important ordeal in the life of a home owner, and even more important if said homeowner lives in a col.The average national cost of window installation is $,, with most homeowners spending between $, and $,. This data is based on actual project costs as .The national average cost of furnace replacement is $,, with most homeowners spending between $, and $,. This data is based on actual project costs as .

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Jump to Average Furnace Prices The average price for a standard AFUE natural gas furnace is around $,..